* Touch up readme info graphics

* Add layers to easily recreate the single steps
* Re-group objects
* Transform white rectangles for interrupting arrows into paths
* Adapt rectangle path forms to make arrow interruptions nicer
* Centre repository names in their repository boxes
* Add simple to hack to remove double rounded border problem in step 3
* Set background colour to white (was transparent before)
* Update repo cloning graphics to reflect changes in SVG file; optipng'ed
* Fix newline problems in repo cloning graphics SVG

* Remove superfluous newlines
* Add missing newline at end of file
Merge pull request #388 from stevenkoenig/fix-readme-info-gfx

Fix readme info gfx
Add link to older installers for Git for OS X

The current Git installer for OS X is broken for many pre-10.8
systems. The older installers seem to solve this problem.
Merging work done on master branch since November 2013 tag
Merge pull request #460 from gvwilson/gh-pages

Merging all changes done since November 2013 tag.
The filename `aux` was reserved in the days of DOS, and that proscription has been retained to the present day. This PR therefore renames the recently-created `aux` directory to `misc` so that people can pull this repository on Windows.
Merge pull request #465 from gvwilson/gh-pages

Renaming aux to misc to avoid problems on Windows.
*   Simplified Makefile and added documentation.
*   New and improved Windows installer.
*   Updated ggplot2 example.
*   Renamed the `aux` directory to `misc` (since `aux` conflicts with Windows filesystem conventions).
*   Added image files produced from IPython Notebooks.
*   Added climate data example as wrap-up to Python lessons.
*   Added links to how-to videos for instructors.
*   Added lesson on `doit`.
*   Added lesson on multiprocessing in Python.
*   Added `bin/swc_index_validator.py` to check formatting of bootcamp home pages.
*   Put rules for compiling IPython Notebooks into separate `ipynb.mk` Makefile.
*   Created `bin/setup-bootcamp.sh` to create and fill a bootcamp repository.
*   Removing deprecated lesson material.
*   Many small changes to lessons, glossary, formatting, etc.
Merge pull request #530 from gvwilson/gh-pages

Bringing in changes April-June 2014
* Add small changes to README.md
* Add clarifications to CONTRIBUTING.md
* Split 'Locations and Formats'
* Rewrite 'Formats' paragraph
* Remove superfluous newline
* Remove superfluous <br />s
* Make the word 'Makefile' stand out
* Fix Markdown mark-up
Merge pull request #543 from stevenkoenig/readme-and-contributing-changes

Readme and contributing changes
Added novice reference page on recognising shell, Python and editors within a shell window and how to exit from these
Merge pull request #551 from mikej888/prompts

Added novice reference page on prompts and exits
adding gh-pages